I've been searching through german almanacs for month names and I have a few thoughts. (You are not allowed to view links.
Register or
Login to view.)
Firstly, August is
universally referred to as a word with "Augst" from any german document from ~1400 - ~1600. That includes "Augst" on its own, as well as "Augstmon", "Augstmond", "Augstmonat", "Augstmaent", "Augstmō". Due to this, I find it more likely our "Augst" is the germanic name, as opposed to an obscure French/swiss dialect that has re-introduced the g into "Aoust".
I did find You are not allowed to view links.
Register or
Login to view. that contains both Augst and August.
Something interesting happens post 1500, though. The german names begin to be listed alongside the latin names in these lists. Clearly for some reason both sets of month names became relevant in society. We might be looking for an obscure dialect when we should be looking for an appropriate multicultural city where many languages were commonplace.
Either way, there were certainly learned people who understood and chose to display both the german and latin names. Perhaps somewhere the same thing was done with french/german.
You are not allowed to view links. Register or Login to view.
You are not allowed to view links. Register or Login to view.
You are not allowed to view links. Register or Login to view.
You are not allowed to view links. Register or Login to view.